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Artem Dergachev fbd9678d2f [analyzer] De-duplicate path diagnostics for each exploded graph node. 
The bugreporter::trackNullOrUndefValue() mechanism contains a system of bug
reporter visitors that recursively call each other in order to track where a
null or undefined value came from, where each visitor represents a particular
tracking mechanism (track how the value was stored, track how the value was
returned from a function, track how the value was constrained to null, etc.).

Each visitor is only added once per value it needs to track. Almost. One
exception from this rule would be FindLastStoreBRVisitor that has two operation
modes: it contains a flag that indicates whether null stored values should be
suppressed. Two instances of FindLastStoreBRVisitor with different values of
this flag are considered to be different visitors, so they can be added twice
and produce the same diagnostic twice. This was indeed the case in the affected
test.

With the current logic of this whole machinery, such duplication seems
unavoidable. We should be able to safely add visitors with different flag
values without constructing duplicate diagnostic pieces. Hence the effort
in this commit to de-duplicate diagnostics regardless of what visitors
have produced them.

Differential Revision: https://reviews.llvm.org/D41258

llvm-svn: 321135
 		2017-12-20 01:17:53 +00:00
clang [analyzer] De-duplicate path diagnostics for each exploded graph node. 2017-12-20 01:17:53 +00:00
clang-tools-extra [clangd] Don't use the optional "severity" when comparing Diagnostic. 2017-12-19 20:52:56 +00:00
compiler-rt [hwasan] Fix handling of store errors. 2017-12-19 22:57:02 +00:00
debuginfo-tests [debuginfo-tests] Support moving debuginfo-tests to llvm/projects 2017-12-12 16:54:20 +00:00
libclc configure.py: Add gfx900 (Vega, Raven) 2017-11-27 11:14:06 +00:00
libcxx libcxx: Fix for basic_stringbuf::seekoff() after r320604. 2017-12-19 23:33:16 +00:00
libcxxabi [libcxxabi] Pass LIBCXXABI_SYSROOT and LIBCXXABI_GCC_TOOLCHAIN to lit 2017-12-12 01:20:37 +00:00
libunwind [libunwind][MIPS]: Add support for unwinding in O32 and N64 processes. 2017-12-12 21:43:36 +00:00
lld [WebAssembly] Add test of indirect call to an otherwise unused type 2017-12-20 01:17:45 +00:00
lldb Replace an accidentally added "break" with an LLVM_FALLTHROUGH. 2017-12-19 23:16:38 +00:00
llgo irgen: Create functions instead of global variables for builtin hash and equal algorithms. 2017-06-04 22:11:28 +00:00
llvm [X86] Remove code from combineSext that looks for MVT::i1 after operation legalization which can never happen. 2017-12-20 01:00:01 +00:00
openmp Fix more inconsistent line endings. NFC. 2017-12-18 19:46:56 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly [ScopBuilder] Split statements on encountering store instructions. 2017-12-11 12:51:24 +00:00
README.md Add an svn project to contain the files that appear at the root of the 2017-10-19 21:09:49 +00:00

README.md

Low Level Virtual Machine (LLVM)

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.